::= [[[ "/" ] "/" ] "/" ] ::= "|" | ::= ::= ::= ::= '"' '"' -- IA5 -- (for other chars use hex) | "#" -- US GOSIP | "'" "'H" -- hex | "" -- empty but present ::= "NS" "+" -- concrete binary -- this is the compact -- encoding | "+" [ "+" ] ::= "X121" | "DCC" | "TELEX" | "PSTN" | "ISDN" | "ICD" | "LOCAL" ::= ::= "d" -- abstract decimal | "x" -- abstract binary | "l" -- IA5: local form only | "RFC-1006" "+" "+" [ "+" [ "+" ]] | "X.25(80)" "+" "+" [ "+" "+" ] | "ECMA-117-Binary" "+" "+" "+" | "ECMA-117-Decimal" "+" "+" "+"